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unit RaetselFileUnit;
interface
uses dialogs, math;
type TWort = record
W: array of Byte;
Bits: Integer;
end;
TRaetselFile = class
private
F: File;
wacc: boolean;
inhalt,
conv: array of Byte;
FPoint: Integer;
WB: array of TWort;
procedure FFlush;
procedure initWB;
procedure concatWs(a,b: integer);
function BisAx(A: TWort; B: array of Byte): boolean;
procedure rConvert;
procedure wConvert;
public
Kennung: String;
procedure FAssignfile(FileName: String);
function FReset: boolean;
procedure FRewrite;
procedure FCloseFile;
procedure FBlockWrite(var Data; Len: Integer);
function FBlockRead(var Data; Len: Integer): boolean;
end;
implementation
procedure TRaetselFile.Fassignfile(FileName: String);
begin
AssignFile(F,FileName);
end;
function TRaetselFile.FReset: boolean;
var C: Cardinal;
S: String;
begin
wacc:=false;
Result:=false;
Reset(F,1);
if FileSize(F) < 4 then
begin
FCloseFile;
exit;
end;
Blockread(F,C,4);
if C<>$26594131 then
begin
FCloseFile;
exit;
end;
Setlength(conv,FileSize(F)-4);
Blockread(F,conv[0],length(conv));
rConvert;
if length(inhalt)<length(Kennung) then
begin
FCloseFile;
exit;
end;
S:=Kennung;
FBlockread(S[1],length(S));
if S<>Kennung then
begin
FCloseFile;
exit;
end;
Result:=true;
end;
procedure TRaetselFile.initWB;
var B: Byte;
begin
(* Setlength(WB,128);
for B:=0 to 127 do
begin
Setlength(WB[B].W,2);
WB[B].W[0]:=B;
WB[B].W[1]:=0;
WB[B].Bits:=7;
end; *)
Setlength(WB,2);
setlength(WB[0].W,2);
WB[0].W[0]:=$0;
WB[0].W[1]:=0;
WB[0].Bits:=1;
setlength(WB[1].W,2);
WB[1].W[0]:=$1;
WB[1].W[1]:=0;
WB[1].Bits:=1;
end;
procedure TRaetselFile.concatWs(a,b: integer);
var I: integer;
begin
setlength(WB,length(WB)+1); // WB erweitern
with WB[length(WB)-1] do begin
Bits:=WB[a].Bits+WB[b].Bits;
Setlength(W,(Bits+7) div 8 + 1);
for I:=0 to length(W)-1 do
W[I]:=0;
for I:=0 to length(WB[a].W)-2 do
W[I]:=WB[a].W[I];
for I:=0 to length(WB[b].W)-2 do
begin
W[length(WB[a].W)-2+I]:=
W[length(WB[a].W)-2+I] or
($FF and (WB[b].W[I] shl (WB[a].Bits mod 8)));
if length(WB[a].W)-1+I < length(W) then
W[length(WB[a].W)-1+I]:=
W[length(WB[a].W)-1+I] or
(WB[b].W[I] shr (8 - (WB[a].Bits mod 8)));
end;
end;
end;
function TRaetselFile.BisAx(A: TWort; B: array of Byte): boolean;
var I: Integer;
begin
Result:=true;
for I:=0 to (A.Bits div 8)-1 do
Result:=Result and (A.W[I] = B[I]);
Result:=Result and ((A.W[length(A.W)-2] and ($FF shr (8-(A.Bits mod 8)))) =
(B[length(A.W)-2] and ($FF shr (8-(A.Bits mod 8)))));
end;
procedure TRaetselFile.rConvert;
var rP: longint;
wP,I: integer;
passt,lp: integer;
wBuff: byte;
begin
initWB;
Setlength(inhalt,0);
rP:=0;
wP:=0;
wBuff:=0;
lp:=-1;
setlength(conv,length(conv)+1);
conv[length(conv)-1]:=0;
while rP<((length(conv)-1)*8) do
begin
passt:=0;
for I:=0 to ceil(ln(length(WB))/ln(2))-1 do
begin
passt:=passt or (byte(odd(conv[rP div 8] shr (rP mod 8))) shl I);
inc(rP);
end;
for I:=0 to WB[passt].Bits-1 do
begin
if wP=8 then
begin
setlength(inhalt,length(inhalt)+1);
inhalt[length(inhalt)-1]:=wBuff;
wP:=0;
wBuff:=0;
end;
wBuff:=wBuff or (Byte(odd((WB[passt].W[I div 8] shr (I mod 8)))) shl wP);
inc(wP);
end;
if lp<>-1 then
concatWs(lp,passt);
lp:=passt;
end;
setlength(conv,length(conv)+1);
conv[length(conv)-1]:=wBuff;
end;
procedure TRaetselFile.wConvert;
var rP: longint;
wP,I,J: integer;
rBuff: array of Byte;
rBBits,passt,lp: integer;
wBuff: byte;
begin
initWB;
Setlength(conv,0);
rP:=0;
wP:=0;
wBuff:=0;
lp:=-1;
Setlength(inhalt,length(inhalt)+1);
inhalt[length(inhalt)-1]:=0;
while rP<((length(inhalt)-1)*8) do
begin
setlength(rBuff,0);
rBBits:=0;
passt:=-1;
for I:=length(WB)-1 downto 0 do
with WB[I] do begin
if Bits > (8*length(inhalt) - rP) then continue;
if Bits > rBBits then
begin // mehr r-Buffern
Setlength(rBuff,(Bits+7) div 8);
rBBits:=Bits;
for J:=0 to length(rBuff)-1 do
begin
rBuff[J]:=0;
if J + rP div 8 < length(inhalt) then
rBuff[J]:=rBuff[J] or (inhalt[J + rP div 8] shr (rP mod 8));
if J+1 + rP div 8 < length(inhalt) then
rBuff[J]:=rBuff[J] or ($FF and (inhalt[(rP div 8) + J+1] shl (8-(rP mod 8))));
end;
end;
if ((passt=-1) or (WB[passt].Bits < WB[I].Bits)) and
BisAx(WB[I],rBuff) then
passt:=I;
end;
if passt=-1 then // geht ja gar nicht ...
begin // ... geht ja wohl!
Messagedlg('Zu wenig Wörter im Wörterbuch!',mterror,[mbOk],0);
exit;
end;
rP:=rP+WB[passt].Bits;
for I:=0 to ceil(ln(length(WB))/ln(2))-1 do
begin // WB-index speichern
if wP=8 then
begin // w-buffer leeren
setlength(conv,length(conv)+1);
conv[length(conv)-1]:=wBuff;
wP:=0;
wBuff:=0;
end;
wBuff:=wBuff or Byte(odd(passt shr I)) shl wP;
inc(wP);
end;
if lp<>-1 then
concatWs(lp,passt);
lp:=passt;
end;
setlength(conv,length(conv)+1);
conv[length(conv)-1]:=wBuff;
end;
procedure TRaetselFile.FFlush;
begin
wConvert;
BlockWrite(F,conv[0],length(conv));
SetLength(inhalt,0);
end;
procedure TRaetselFile.FRewrite;
var C: Cardinal;
begin
wacc:=true;
Rewrite(F,1);
C:=$26594131;
BlockWrite(F,C,4);
Setlength(inhalt,length(Kennung));
Move(Kennung[1],inhalt[0],length(Kennung));
FPoint:=length(inhalt);
end;
procedure TRaetselFile.FCloseFile;
begin
if wacc then
begin
FFlush;
CloseFile(F);
end;
Setlength(inhalt,0);
FPoint:=0;
end;
procedure TRaetselFile.FBlockWrite(var Data; Len: Integer);
begin
Setlength(inhalt,length(inhalt)+Len);
Move(Data,inhalt[FPoint],Len);
FPoint:=length(inhalt);
end;
function TRaetselFile.FBlockRead(var Data; Len: Integer): boolean;
begin
Result:=Len<=(length(inhalt)-FPoint);
if not Result then
begin
FCloseFile;
exit;
end;
Move(inhalt[FPoint],Data,Len);
FPoint:=FPoint+Len;
end;
end.
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